I honestly believe its essential to have a forgiving heart when it comes to your marriage, or any relationship for that matter.  Without having the ability to forgive you--are robbing yourself of what could be an amazing relationship for you both. Not everything is reconcilable, don't get me wrong. But in most circumstances It's an honorable thing to be able to say "Im sorry" and if you end up saying this often in your marriage, I think its a good thing. 

Really, you are just two imperfect people and life is not perfect, your relationship isn't going to always be perfect. Learn to forgive and give each other grace.